IOCTL_NFP_GET_MAX_MESSAGE_BYTES IOCTL

Description

A client sends the IOCTL_NFP_GET_MAX_MESSAGE_BYTES request to any generic handle, one that is non-published and non-subscribed, to the provider device to determine the maximum message size supported.

Parameters

Major code

Input buffer

None

Input buffer length

Output buffer

One INT32 value that defines the maximum message size supported by the provide.

Output buffer length

Input/output buffer

Input/output buffer length

Status block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful.

Otherwise, Status to the appropriate error condition as a NTSTATUS code.

For more information, see NTSTATUS Values.

Remarks

• Each provider implementation can specify a maximum message size for publications and subscriptions. Windows requires that this maximum provider-supported message size be no less than 10 KB.
• The following are required actions when using this ioctl:
  • The driver MUST support a maximum message size no smaller than 10 KB.
  • When this IOCTL is received, the driver MUST copy the maximum message size into the output buffer and complete it with STATUS_SUCCESS.

See also

Near field communication (NFC) overall design guide

Near field proximity design guide (Tap and Do, NFP provider model, driver requirements)